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Thermographic printing arrangement

阅读:647发布:2023-02-21

专利汇可以提供Thermographic printing arrangement专利检索,专利查询,专利分析的服务。并且A dot-matrix thermographic printing head is disclosed which is particularly adapted to print on the thermosensitive record while that record is in continuous relative motion with respect to said printing head (i.e., ''''in flight'''') comprising a plurality of printing surfaces each adapted to be selectively actuated and each having a printing surface in the form of a long thin rectangle. There is also disclosed spring arrangements which assure that changes in the length of the print heads due to electronic erosion are compensated for automatically. There is also disclosed electronic arrangements to prevent the head from overheating due to successive activations.,下面是Thermographic printing arrangement专利的具体信息内容。

1. In a thermographic printing unit, a plurality of printing elements, each being connected to a source of electric energy and each having an end in contact with one surface of a heat conductive element, the opposite surface of said heat conductive element being adapted to support moving thermosensitive paper, said end of each of said printing elements having a printing surface, the surface having a longitudinal dimension which is substantially greater than the latitudinal dimension, said longitudinal dimension being perpendicular to the direction of movement of said paper, each of said printing elements having a rectangular body and a tapered portion, the tapered portion being between the printing surface and the body.
2. The unit according to claim 1, wherein each element is held in contact with said heat conductive element by means of a spring.
3. In a thermographic printing unit including a plurality of printing elements, each element having an individual activating unit, the plurality of elements sharing a voltage source and a long term compEnsation network, said long term network having a capacitor which is charged by said source and which supplies the individual activating units with energy, said activating units having a short term compensation network which includes a resistor in parallel with a capacitor, said long and short term networks being connected by a switch.
4. In a thermographic printing unit, a plurality of printing elements, each being connected to a source of electric energy and each having an end in contact with one surface of a heat conductive element, the opposite surface of said heat conductive element being adapted to support a thermosensitive paper in continuous relative motion with respect to said thermographic printing unit during each printing operation, said end of each of said printing elements having a longitudinal dimension which is substantially greater than the latitudinal dimension, said longitudinal dimension being perpendicular to the direction of movement of said paper, each of said printing elements having a rectangular body and a tapered portion, the tapered portion being between the printing surface and the body.
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